added variable

env

 DNS_HOSTMASTER=hostmaster.rthoni.com
 DNS_NS1=ns1.rthoni.com
 DNS_NS2=ns2.rthoni.com
+DNS_TTL=600

pdns/vars-vars

 DNS_HOSTMASTER
 DNS_NS1
 DNS_NS2
+DNS_TTL

poweradmin/poweradmin-2.1.7/inc/config.inc.php

 $dns_hostmaster   = 'DNS_HOSTMASTER';
 $dns_ns1    = 'DNS_NS1';
 $dns_ns2    = 'DNS_NS2';
-$dns_ttl = 600;
+$dns_ttl = DNS_TTL;

poweradmin/vars-vars

 DNS_HOSTMASTER
 DNS_NS1
 DNS_NS2
+DNS_TTL